CN101843115A - Auditory sensibility correction device - Google Patents
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- CN101843115A CN101843115A CN200880114197A CN200880114197A CN101843115A CN 101843115 A CN101843115 A CN 101843115A CN 200880114197 A CN200880114197 A CN 200880114197A CN 200880114197 A CN200880114197 A CN 200880114197A CN 101843115 A CN101843115 A CN 101843115A
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- 238000012937 correction Methods 0.000 title claims abstract description 41
- 230000005236 sound signal Effects 0.000 claims abstract description 113
- 238000012545 processing Methods 0.000 claims abstract description 42
- 238000013508 migration Methods 0.000 claims description 22
- 230000005012 migration Effects 0.000 claims description 22
- 238000012935 Averaging Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 5
- 230000008569 process Effects 0.000 abstract description 5
- 238000001914 filtration Methods 0.000 description 14
- 230000008859 change Effects 0.000 description 12
- 238000012360 testing method Methods 0.000 description 8
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- 238000006243 chemical reaction Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 230000014759 maintenance of location Effects 0.000 description 4
- 230000004044 response Effects 0.000 description 4
- 230000035945 sensitivity Effects 0.000 description 4
- 238000009499 grossing Methods 0.000 description 2
- 230000001915 proofreading effect Effects 0.000 description 2
- 230000011218 segmentation Effects 0.000 description 2
- 230000001934 delay Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
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- 239000011435 rock Substances 0.000 description 1
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G9/00—Combinations of two or more types of control, e.g. gain control and tone control
- H03G9/02—Combinations of two or more types of control, e.g. gain control and tone control in untuned amplifiers
- H03G9/025—Combinations of two or more types of control, e.g. gain control and tone control in untuned amplifiers frequency-dependent volume compression or expansion, e.g. multiple-band systems
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
- G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
- G10L21/0316—Speech enhancement, e.g. noise reduction or echo cancellation by changing the amplitude
- G10L21/0364—Speech enhancement, e.g. noise reduction or echo cancellation by changing the amplitude for improving intelligibility
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/04—Circuits for transducers, loudspeakers or microphones for correcting frequency response
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
- G10L21/06—Transformation of speech into a non-audible representation, e.g. speech visualisation or speech processing for tactile aids
- G10L2021/065—Aids for the handicapped in understanding
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
- G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
- G10L21/0208—Noise filtering
- G10L21/0264—Noise filtering characterised by the type of parameter measurement, e.g. correlation techniques, zero crossing techniques or predictive techniques
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2430/00—Signal processing covered by H04R, not provided for in its groups
- H04R2430/01—Aspects of volume control, not necessarily automatic, in sound systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2430/00—Signal processing covered by H04R, not provided for in its groups
- H04R2430/03—Synergistic effects of band splitting and sub-band processing
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Abstract
Provided is an auditory sensibility correction device which can add a preferable loudness characteristic to an output sound without depending on a sound source characteristic of an audio signal even when the audio signal has a high band or low band subjected to a loudness correction. The auditory sensibility correction device (1) includes: loudness processing means (2) which executes a loudness process on an audio signal in accordance with a band; level difference calculation means (4) which calculates a level difference between a signal level of each band and a signal level of all the bands; gain offset means (4) which performs an offset process of a gain required by the entire band signal level according to the level difference of each band; and gain setting means (5) which applies the correction gain of each band to the audios signal of each band which has been subjected to the loudness process.
Description
Technical field
The present invention relates to auditory sensibility correction device, and more specifically, thus relate to audio signal be divided into different frequency bands audio signal, to these audio signals use filtering, and the audio signal of synthetic consequent audio signal after synthetic add the auditory sensibility correction device of loudness characteristic.
Background technology
Audio reproducing system generally has the volume controller that is used to control from the volume of the sound of loud speaker output.The user operates this volume controller suitably to control from the volume of the sound of outputs such as loud speaker.
Yet common volume controller only can realize that certain volume control range (for example, is about+6dB～12dB), and operate volume controller simply and can not satisfy volume control range that realizes broad or the requirement with tonequality of abundant loudness.
In order to satisfy this requirement, proposed to proofread and correct the loudness control device (auditory sensibility correction device) (for example, referring to patent documentation 1) of hearing sensitivity with respect to the volume of output sound.This loudness control device is divided into audio signal the audio signal of the different frequency bands of low-frequency band, midband and high frequency band, and the audio signal of synthetic each frequency band when the operational ton in conjunction with volume controller changes the gain of low frequency, intermediate frequency and high frequency, audio signal with after synthetic from outputs such as loud speakers realizes the hearing sensitivity correction thus.
Patent documentation 1: TOHKEMY 2000-197182 (the 4-5 page or leaf, Fig. 1)
Summary of the invention
The problem that invention will solve
Aforementioned loudness control device changes (gain calibration) to the audio signal using gain by the different frequency bands that band segmentation obtained, and synthetic then consequent audio signal is proofreaied and correct (hearing sensitivity correction) to realize loudness thus.Yet the audio-source that constitutes audio signal comprises the various classifications of classical music, pop and rock music etc.In addition, in each classification, the audio-source that exists the output stage of many low-frequency bands or high frequency band to be enhanced in advance.Therefore, when to comprising that the audio signal that has strengthened the audio-source of output stage in advance at each frequency band uses aforesaid loudness timing, although the output stage of low-frequency band or high frequency band is enhanced, yet this output stage may further be strengthened undesirably.The audio signal that the output stage of high frequency band or low-frequency band is greatly strengthened may produce because the sound that the output stage of high frequency band or low-frequency band is enhanced thereby is difficult to hear with regard to hearing sensitivity, perhaps cause from loud speaker output distortion sound, thereby make the remarkable deterioration of tonequality.
Consider above problem and made the present invention, even and the purpose of this invention is to provide at the high frequency band of audio signal or low-frequency band and carried out the loudness timing, also can under the situation of the sound source characteristic that does not rely on this audio signal, add the auditory sensibility correction device of good loudness characteristic to output sound.
The scheme that is used to deal with problems
In order to overcome the above problems, according to the present invention, provide a kind of auditory sensibility correction device, comprising: the loudness processing unit is used for audio signal is divided into the audio signal of different frequency bands, and handles according to band applications loudness; Differential calculating unit, be used at each frequency band, poor between the signal level of signal level and the audio signal of the full range band that has carried out described loudness processing of audio signal of each frequency band that described loudness handles carried out in calculating by described loudness processing unit, as differential signal; The gain biasing element is used for the described differential signal that calculates at each frequency band based on by described differential calculating unit, at the gain application migration processing of each frequency band to the audio signal of the full range band that carried out described loudness and handle; And gain is provided with parts, the audio signal that is used for having carried out each frequency band that described loudness handles multiplies each other with the correcting gain that has been carried out each frequency band of described migration processing by described gain biasing element, and the audio signal of each frequency band handled of will having carried out multiplying each other and the audio signal addition of having carried out the full range band that described loudness handles.
According to auditory sensibility correction device of the present invention, the correcting gain that makes differential signal based on each frequency band carry out each frequency band of migration processing multiplies each other with the audio signal of having carried out each frequency band that loudness handles, then with the audio signal addition of full range band.Thereby, can calculate at each frequency band according to the differential signal of differential each frequency band of expression and will be applied to the yield value that the treatment for correcting of having carried out the audio signal that loudness handles is used.Therefore, by the audio signal of having carried out each frequency band that loudness handles being used the yield value that the treatment for correcting that calculated is used, can be that each frequency band adds suitable loudness effect, make that thus the tonequality of audio signal of final output is better.
Described auditory sensibility correction device can also comprise: the first answer speed control assembly, be used for the audio signal of having been carried out the full range band that described loudness handles by described loudness processing unit is carried out answer speed control, so that the variation of the signal level of this audio signal is level and smooth; And gain calibration parts, be used for according to the frequency band that will carry out described migration processing by described gain biasing element, the audio signal using gain that has been changed signal level by the described first answer speed control assembly is proofreaied and correct, wherein, described gain biasing element carries out described migration processing to the signal that has been carried out described gain calibration by described gain calibration parts.
After the variation of the signal level by making the audio signal of having carried out the full range band that loudness handles at the first answer speed control assembly is level and smooth each frequency band is carried out gain calibration, can obtain to be fit to be applied to audio signal in advance by the follow-up migration processing that biasing element carried out that gains.This makes by the gain migration processing that biasing element carried out more effective.
Described auditory sensibility correction device can also comprise: the second answer speed control assembly, be used for carrying out answer speed control at the described differential signal that each frequency band calculated by described differential calculating unit, with at each frequency band to described averaging of differential signal; And calculations of offset parts, be used for based on by the differential signal of the described second answer speed control assembly after at each frequency band equalization, calculate the gain side-play amount of using in the described migration processing of being undertaken by described gain biasing element at each frequency band, wherein, described gain biasing element carries out described migration processing by using by described calculations of offset parts at the described gain side-play amount that each frequency band calculates.
By controlling to carrying out answer speed at the differential signal that each frequency band calculated by differential calculating unit, can be at each frequency band to averaging of differential signal.Thereby, can be at each frequency band employed gain side-play amount of calculated for subsequent migration processing easily and effectively.
The effect of invention
According to auditory sensibility correction device of the present invention, the correcting gain that the differential signal based on each frequency band will be able to be carried out each frequency band of migration processing has been applied to carry out the audio signal of each frequency band of loudness processing.Thereby, can carry out sufficient gain calibration according to the level of the audio signal of having carried out each frequency band that loudness handles, thereby make and can audio signal be used suitable loudness proofread and correct under the situation of high frequency that does not rely on audio signal or frequency acoustic characteristic.This has prevented from loud speaker output distortion sound, thereby has made the user can listen to the music of high tone quality.
Description of drawings
Fig. 1 is the block diagram that illustrates according to the schematic construction of the auditory sensibility correction device of the embodiment of the invention.
Fig. 2 is the block diagram that illustrates according to the schematic construction of the loudness filter section of present embodiment.
Fig. 3 is the figure that the filter characteristic of the high pass filter that uses in the loudness filter section of present embodiment and low pass filter is shown.
Fig. 4 illustrates according to the maximum of present embodiment to detect and the block diagram of the schematic construction of maximum maintaining part.
(a) of Fig. 5 is illustrated in the figure that time of detected maximum in the audio signal of full range band and retention value thereof changes, (b) of Fig. 5 is illustrated in the figure that time of detected maximum in the audio signal of low-frequency band and retention value thereof changes, and Fig. 5 (c) is illustrated in the figure that time of detected maximum in the audio signal of high frequency band and retention value thereof changes.
Fig. 6 is the block diagram that illustrates according to the schematic construction of the gain calculating portion of present embodiment.
Fig. 7 be illustrate at low frequency initial/discharge filter section A, low frequency initial/discharge filter section B, high frequency initial/discharge filter section A and high frequency initial/discharge zero-time that filter section B is provided with respectively and the table of release time.
(a) of Fig. 8 be illustrate by low frequency initial/discharge filter section A and high frequency initial/discharge filter section A the audio signal of full range band is used the figure that the level of the audio signal that filtering obtained changes, (b) of Fig. 8 be illustrated in application by low frequency initial/discharge filter section B and high frequency initial/discharge the figure of the differential signal before the filtering that filter section B carried out, and Fig. 8 (c) be illustrated in application by low frequency initial/discharge filter section B and high frequency initial/discharge the figure of the differential signal after the filtering that filter section B carried out.
Fig. 9 is the figure that is illustrated in according to the correcting value of the filter gain of using in the low frequency look-up table portion of present embodiment and the high frequency look-up table portion.
Figure 10 is the figure that is illustrated in according to the gain side-play amount that is provided with in low frequency calculations of offset portion of the present invention and the high frequency offset calculating part.
(a) of Figure 11 is the figure that illustrates from the correcting gain of the signal of low frequency look-up table portion and high frequency look-up table portion output, (b) of Figure 11 is illustrated in the low-frequency gain that is provided with in low frequency calculations of offset portion and the high frequency offset calculating part and the gain side-play amount of high-frequency gain, and Figure 11 (c) is the figure that the state of the signal that has carried out the gain calibration shown in Figure 11 (a) being proofreaied and correct based on the gain side-play amount shown in Figure 11 (b) is shown.
Figure 12 illustrates the block diagram that the schematic construction of portion is set according to the gain of present embodiment.
(a)～(c) of Figure 13 be illustrated in the signal level that will be imported be set to respectively 0dB ,-12dB ,-24dB and-situation of 36dB under the frequency characteristic of white noise change, wherein, the frequency characteristic that (a) of Figure 13 is illustrated in white noise under the situation of not using any correction changes, (b) of Figure 13 is illustrated in the frequency characteristic of only using white noise under the situation that loudness proofreaies and correct to be changed, and Figure 13 (c) be illustrated in use that loudness is proofreaied and correct and the two situation of gain migration processing under the frequency characteristic of white noise change.
(a)～(c) of Figure 14 be illustrated in the signal level that will be imported be set to respectively 0dB ,-12dB ,-24dB and-situation of 36dB under the frequency characteristic of pink noise change, wherein, the frequency characteristic that (a) of Figure 14 is illustrated in pink noise under the situation of not using any correction changes, (b) of Figure 14 is illustrated in the frequency characteristic of only using pink noise under the situation that loudness proofreaies and correct to be changed, and Figure 14 (c) be illustrated in use that loudness is proofreaied and correct and the two situation of gain migration processing under the frequency characteristic of pink noise change.
Description of reference numerals
1 auditory sensibility correction device
2 loudness filter section (loudness processing unit)
3 maximums detect and the maximum maintaining part
4 gain calculating portions
5 gains are provided with portion's (gain is provided with parts)
7 (the loudness filter section) LPF portion
8 (the loudness filter section) HPF portion
9,10,11 delay portions
12,13,14 (maximum detection and maximum maintaining part) maximum test section
16,17,18 (maximum detection and maximum maintaining part) maximum maintaining part
20,21,22 (maximum detection and maximum maintaining part) limiter portion
25 (gain calculating portion) low frequency level calculating part (differential calculating unit)
26 (gain calculating portion) high-frequency stage calculating part (differential calculating unit)
28 (gain calculating portion) low frequency is initial/discharge filter section A (the first answer speed control assembly)
29 (gain calculating portion) low frequency is initial/discharge filter section B (the second answer speed control assembly)
30 (gain calculating portion) high frequency is initial/discharge filter section A (the first answer speed control assembly)
31 (gain calculating portion) high frequency is initial/discharge filter section B (the second answer speed control assembly)
33 (gain calculating portion) low frequency look-up table portion (gain calibration parts)
34 (gain calculating portion) high frequency look-up table portion (gain calibration parts)
36 (gain calculating portion) low frequency calculations of offset portion (calculations of offset parts)
37 (gain calculating portion) high frequency offset calculating part (calculations of offset parts)
39 (gain calculating portion) low-frequency gain offset portion (gain biasing element)
40 (gain calculating portion) high-frequency gain offset portion (gain biasing element)
41 (gain calculating portion) low-frequency gain converter section
42 (gain calculating portion) high-frequency gain converter section
43,44 (gain calculating portion) LPF portions
46,47 (gain is provided with portion) multiplier
48 (gain is provided with portion) addition portion
Embodiment
Now, will illustrate according to auditory sensibility correction device of the present invention.Auditory sensibility correction device of the present invention is under the situation of the sound source characteristic of considering audio signal, handle using loudness by the audio signal of the different frequency bands (being low-frequency band and high frequency band in the present embodiment) that band segmentation obtained, regardless of the sound source characteristic of original audio signal, all add good audio thus.
Fig. 1 is the block diagram that the schematic construction of auditory sensibility correction device is shown.Auditory sensibility correction device 1 comprises that loudness filter section (loudness processing unit) 2, maximum detect and maximum maintaining part 3, gain calculating portion 4 and gain are provided with portion's (gain is provided with parts) 5.
The loudness filter section
Loudness filter section 2 is divided into the audio signal of these three frequency bands of full range band, low-frequency band and high frequency band with the audio signal of being imported, and each band applications loudness is handled.As shown in Figure 2, loudness filter section 2 HPF portion 8 and three delay portions 9,10 and 11 of comprising the LPF portion 7 that constitutes by low pass filter, constituting by high pass filter.
As low pass filter and high pass filter, use FIR (the Finite Impulse Response of linear phase, finite impulse response) filter, phase deviation are to the maximum ± first order IIR (Infinite Impulse Response, the infinite impulse response) filters etc. of 90 degree.Fig. 3 is illustrated in to use the figure of FIR filter as the filter characteristic under the situation of low pass filter and high pass filter.In Fig. 3, the tap number of low pass filter and cut-off frequency are set to 192 and 100Hz respectively, and the tap number of high pass filter and cut-off frequency are set to 16 and 10kHz respectively.
When using high pass filter shown in Figure 3 and low pass filter respectively as HPF portion 8 and LPF portion 7 simultaneously, in the audio signal of full range band, low-frequency band, carried out having carried out in the audio signal of filtering and the high frequency band producing between the audio signal of filtering postpone poor.
In order to handle above problem, delay portion 9～11 is used for being provided with and the corresponding delay of 96 taps (192/2) at the full range band, in the HPF portion 8 that uses filtering by high pass filter, be provided with and the corresponding delay of 88 taps ((192/2)-(16/2)), and in by the LPF portion 7 of application of low pass filters filtering, be provided with and 0 corresponding delay of tap.This makes the audio signal from these three frequency bands of full range band, low-frequency band and high frequency band of loudness filter section 2 outputs to be adjusted into to have identical phase place.
In addition, as mentioned above, gain is provided with portion 5 and uses low-frequency gain and high-frequency gain to carry out treatment for correcting.Yet, because maximum detects and the processing of maximum maintaining part 3 and the processing of gain calculating portion 4, it is poor to occur postponing between the moment that the low-frequency gain that will be applied to the audio signal of having carried out filtering in loudness filter section 2 is proofreaied and correct and high-frequency gain is proofreaied and correct.In above delay portion 9～11, also carry out the delay processing that is used to eliminate this delays difference.
Maximum detects and maximum maintaining part 3
Maximum detects and maximum maintaining part 3 is calculated the absolute value of output signal based on the audio signal by full range band, low-frequency band and the high frequency band that frequency division obtained that carry out in loudness filter section 2, and limits the upper and lower bound of the absolute value that calculates at each audio signal.As shown in Figure 4, maximum detects and maximum maintaining part 3 comprises maximum test section 12,13 and 14, maximum maintaining part 16,17 and 18 and limiter portion 20,21 and 22, wherein, each audio signal for full range band, low-frequency band and high frequency band is provided with maximum test section, maximum maintaining part and limiter portion respectively.
Maximum maintaining part 16,17 and 18 will keep predetermined amount of time at the detected maximum of each frequency band by maximum test section 12,13 and 14.Fig. 5 (a) illustrates by maximum maintaining part 16 will be kept the example of predetermined amount of time by the maximum in the audio signal of maximum test section 12 detected full range bands.Fig. 5 (b) illustrates by maximum maintaining part 17 will be kept the example of predetermined amount of time by the maximum in the audio signal of maximum test section 13 detected low-frequency bands.Fig. 5 (c) illustrates by maximum maintaining part 18 will be kept the example of predetermined amount of time by the maximum in the audio signal of maximum test section 14 detected high frequency bands.In the example of Fig. 5 (a)～5 (c), the maximum retention time is set to 16msec.
Gain calculating portion 4
4 calculating of gain calculating portion are used for the HFS of the audio signal of having been carried out the loudness processing by loudness filter section 2 and high-frequency gain and the low-frequency gain that the low frequency part using gain is proofreaied and correct.
As shown in Figure 6, gain calculating portion 4 comprises low frequency level calculating part (differential calculating unit) 25, high-frequency stage calculating part (differential calculating unit) 26, low frequency is initial/discharge filter section A (the first answer speed control assembly) 28, low frequency is initial/discharge filter section B (the second answer speed control assembly) 29, high frequency is initial/discharge filter section A (the first answer speed control assembly) 30, high frequency is initial/discharge filter section B (the second answer speed control assembly) 31, low frequency look-up table portion (gain calibration parts) 33, high frequency look-up table portion (gain calibration parts) 34, low frequency calculations of offset portion (calculations of offset parts) 36, high frequency offset calculating part (calculations of offset parts) 37, low-frequency gain offset portion (gain biasing element) 39, high-frequency gain offset portion (gain biasing element) 40, low-frequency gain converter section 41, high-frequency gain converter section 42, and LPF portion 43 and 44.
Low frequency level calculating part 25 will detect with the level of maximum maintaining part 3 maximum inhibit signals (audio signal) input, the full range band from maximum and carry out comparison with the level of the maximum inhibit signal (audio signal) of low-frequency band.Then, low frequency level calculating part 25 will compare differential as differential signal export to low frequency initial/discharge filter section B 29.
On the other hand, high-frequency stage calculating part 26 will detect with the level of maximum maintaining part 3 maximum inhibit signals (audio signal) input, the full range band from maximum and carry out comparison with the level of the maximum inhibit signal (audio signal) of high frequency band.Then, high-frequency stage calculating part 26 will compare differential as differential signal export to high frequency initial/discharge filter section B 31.
Low frequency is initial/discharge filter section A 28, low frequency initial/discharge filter section B29, high frequency initial/discharge filter section A 30 and high frequency initial/discharge filter section B 31 to use the filter that has been provided with predetermined start time and predetermined release time to the audio signal of being imported separately, thereby the control answer speed.
Zero-time is represented the quick degree of filter reply volume change, and the volume after representing release time to change is back to the slow degree of reset condition.
Low frequency at present embodiment is initial/discharge filter section A 28, low frequency initial/discharge filter section B 29, high frequency initial/discharge filter section A 30 and high frequency initial/discharge among the filter section B 31, zero-time and release time are set shown in the table 1 of Fig. 7.Zero-time and release time set in the table 1 only are examples, and are not limited to these values.
Fig. 8 (a) be illustrate by the low frequency that has been provided with zero-time shown in the table 1 and release time separately initial/discharge filter section A 28 and high frequency initial/discharge 30 couples of filter section A to detect and the audio signals of the full range band of maximum maintaining part 3 inputs are used the figure of the level variation of the audio signal that filtering obtained from maximum.
Compare with the maximum inhibit signal of the full range band shown in Fig. 5 (a), in the audio signal shown in Fig. 8 (a), use by low frequency initial/discharge filter section A 28 and high frequency initial/discharge the filtering that filter section A 30 carried out to make the variation of signal level more level and smooth.Note, as shown in table 1, low frequency is initial/discharge filter section A 28 and high frequency initial/discharge the zero-time among the filter section A 30 and be set to more approaching value release time.Therefore, two signals shown in Fig. 8 (a) have essentially identical characteristic.
Fig. 8 (b) be illustrated in application by low frequency initial/discharge filter section B 29 and high frequency initial/discharge the differential signal before the filtering that filter section B 31 carried out.Fig. 8 (b) illustrates the differential differential signal that expression is exported from high-frequency stage calculating part 26 from the differential differential signal and the expression of 25 outputs of low frequency level calculating part.
Fig. 8 (c) be illustrated in application by low frequency initial/discharge filter section B 29 and high frequency initial/discharge the differential signal after the filtering that filter section B 31 carried out.So that zero-time is long and make the rising answer speed slow, can obtain high frequency difference frequency sub-signal and low frequency difference signal after the equalization shown in Fig. 8 (c) by shown in the table 1 of Fig. 7, filter being set.
34 conversions of low frequency look-up table portion 33 and high frequency look-up table portion from low frequency initial/discharge filter section A 28 and high frequency initial/discharge the level of the signal of filter section A 30 inputs.In the present embodiment, calculate and the corresponding output signal of input signal in advance, and this output signal is stored in the table, to carry out the level conversion.
Fig. 9 is illustrated in the correcting value of the filter gain of using in low frequency look-up table portion 33 and the high frequency look-up table portion 34.As shown in Figure 9, when signal level was 0dB, the filter gain amount of low frequency look-up table portion 33 and high frequency look-up table portion 34 all was 0dB.When signal level be-during 30dB, the amount of gain of low frequency look-up table portion 33 is corrected as 24dB, and the amount of gain of high frequency look-up table portion 34 is corrected as 20dB.
The figure that the gain calibration amount is shown of Fig. 9 only is the example that is used for the information of definite gain calibration amount.Therefore, and nonessential figure according to Fig. 9 is provided with the gain calibration amount, and the gain calibration amount can suitably change according to the characteristic of audio signal.
Low frequency calculations of offset portion 36 and high frequency offset calculating part 37 based on by low frequency initial/discharge filter section B 29 and high frequency initial/discharge the differential signal that filter section B 31 has carried out filtering, the side-play amount of low-frequency gain and the side-play amount of high-frequency gain are set.
Figure 10 is the figure that is illustrated in the gain side-play amount that is provided with in low frequency calculations of offset portion 36 and the high frequency offset calculating part 37.When the signal in the differential signal is differential when being 0dB, the gain side-play amount of the low-frequency gain that is provided with in low frequency calculations of offset portion 36 is-6dB, and the gain side-play amount of the high-frequency gain that is provided with in high frequency offset calculating part 37 is-16dB.When the signal in the differential signal is differential be-during 40dB, the gain side-play amount of the gain side-play amount of the low-frequency gain that is provided with in low frequency calculations of offset portion 36 and the high-frequency gain that is provided with in high frequency offset calculating part 37 all is 0dB.
The figure that the gain side-play amount is shown of Figure 10 only is the example that is used for the information of definite gain side-play amount.Therefore, and nonessential figure according to Figure 10 is provided with the gain side-play amount, and the gain side-play amount can suitably change according to the characteristic of audio signal.
Low-frequency gain offset portion 39 and high-frequency gain offset portion 40 are provided with side-play amount for the amount of gain of having carried out grade input signal of proofreading and correct in low frequency look-up table portion 33 and high frequency look-up table portion 34.
Figure 11 (a) is the figure that illustrates from the signal of low frequency look-up table portion 33 and 34 outputs of high frequency look-up table portion.More specifically, Figure 11 (a) illustrates and has carried out the signal that low-frequency gain is proofreaied and correct and high-frequency gain is proofreaied and correct.Figure 11 (b) is illustrated in the low-frequency gain of setting in low frequency calculations of offset portion 36 and the high frequency offset calculating part 37 and the gain side-play amount of high-frequency gain.
Figure 11 (c) is the figure that the state of the signal that has carried out gain calibration of Figure 11 (a) being proofreaied and correct based on the gain side-play amount shown in Figure 11 (b) is shown.In Figure 11 (c), the gain of using 5dB to low-frequency gain reduces, and uses the gain reduction of 12dB to high-frequency gain.
Low-frequency gain converter section 41 and high-frequency gain converter section 42 are provided with before the HFS of 5 pairs of audio signals of portion and low frequency part carry out gain calibration in gain, high-frequency gain and low-frequency gain are carried out conversion process, thereby make and in gain the gain that obtains expectation in the portion 5 to be set.
Low-frequency gain converter section 41 and high-frequency gain converter section 42 are according to following formula, to carried out the input signal using gain conversion of gain calibration by low-frequency gain offset portion 39 and high-frequency gain offset portion 40.
y＝(10^(x/20))-1
Wherein, x is input signal (its unit is a decibel [dB]), and y is the output signal (its unit is linear) after the conversion, and ^ is the symbol of expression exponentiation.
Gain is provided with portion
Gain is provided with the signal level of portion 5 according to audio signal, to the adjustment (signal level variable process) that gains of the low frequency part of having been carried out the audio signal that loudness handles by loudness filter section 2 and HFS, thereby makes the loudness effect of audio signal good.
As shown in figure 12, gain is provided with portion 5 and comprises multiplier 46 and 47 and addition portion 48.The multiplier 46 that gain is provided with portion 5 multiply by the audio signal of the low-frequency band imported from the low-frequency gain of gain calculating portion 4 outputs.Multiplier 47 multiply by the audio signal of the high frequency band imported from the high-frequency gain of gain calculating portion 4 outputs.Afterwards, addition portion 48 will be from the audio signal of the full range band of loudness filter section 2 input, carried out the multiply each other audio signal of the low-frequency band handled and carried out high-frequency gain multiply each other the audio signal addition of the high frequency band handled and the good audio signal of output loudness effect by multiplier 47 of low-frequency gain by multiplier 46.
Figure 13 (a)～13 (c) be illustrated in signal level be set to respectively 0dB ,-12dB ,-24dB and-situation of 36dB under the frequency characteristic of white noise change.Figure 14 (a)～14 (c) be illustrated in the signal level that will be imported be set to respectively 0dB ,-12dB ,-24dB and-situation of 36dB under the frequency characteristic of pink noise change.
More specifically, Figure 13 (a) and 14 (a) are illustrated in that the frequency characteristic of white noise and pink noise changes under the situation of the auditory sensibility correction device 1 that does not use present embodiment.Figure 13 (b) and 14 (b) are illustrated in and only use that the frequency characteristic of white noise and pink noise changes under the situation that loudness proofreaies and correct.Figure 13 (c) and 14 (c) are illustrated in that the frequency characteristic of white noise and pink noise changes under the situation of the auditory sensibility correction device 1 that uses present embodiment.
Compare with the level of not using the audio signal of proofreading and correct shown in Figure 13 (a) and Figure 14 (a), shown in Figure 13 (b) and 14 (b), when using the loudness timing to each audio signal, the level of low-frequency band and high frequency band strengthens.When 1 pair of audio signal of the auditory sensibility correction device that uses present embodiment is used loudness correction and gain migration processing, shown in Figure 13 (c) and 14 (c), can suppress the gain of low-frequency band and high frequency band.Thereby, the auditory sensibility correction device 1 of the application of the invention, even when the output stage of low-frequency band and high frequency band has greatly been strengthened by the loudness processing of being undertaken by loudness filter section 2, also the gain of low-frequency band and high frequency band can be adjusted to suitable level.
Especially, as apparent, when signal level is high, can realize further deamplification level from Figure 13 (c) and 14 (c).In addition, than higher white noise, can realize further reducing the level of high frequency band for the level of comparing high frequency band with pink noise.
As mentioned above, in auditory sensibility correction device 1 according to the present invention, gain calculating portion 4 differential based between the signal level of the signal of differential and full range band and high frequency band between the signal level of the signal of full range band and low-frequency band, low-frequency gain migration processing and high-frequency gain migration processing are carried out in the gain of the signal level of the signal of use full range band, and calculation correction is handled the low-frequency gain and the high-frequency gain of usefulness thus.Then, gain is provided with audio signal that 5 pairs in portion carried out low-frequency band that loudness handles and high frequency band by loudness filter section 2 and carries out that LFC low-frequency correction is handled and the high frequency correction processing.Thereby, in the audio signal of having carried out the loudness processing by auditory sensibility correction device 1, use high-frequency gain and low-frequency gain to proofread and correct the level of high frequency band and the level of low-frequency band, even make the level of high frequency band and grade audio-source that has been enhanced in advance of low-frequency band also can represent suitable loudness effect.
Especially, 4 pairs in gain calculating portion has carried out the sampled audio signal that loudness is proofreaied and correct, differential with between the level of the signal of differential and full range band and high frequency band between the level of the signal that calculates full range band and low-frequency band.Afterwards, gain calculating portion 4 is based on the differential low-frequency gain and the high-frequency gain that comes calculation correction to handle usefulness of each frequency band that calculates.Thereby, calculate the value of low-frequency gain and the value of high-frequency gain according to the enhanced situation (enhancing degree) of the audio-source that grade has been enhanced of the level of low-frequency band and high frequency band.As a result, no matter use the audio-source of which kind of type, can add best loudness characteristic to the audio signal that generates from this audio-source according to the characteristic (and finally, not relying on the characteristic of audio-source) of audio-source.
Thereby, auditory sensibility correction device 1 is used to carry out loudness and proofreaies and correct, under the situation of the high and low frequency acoustic characteristic that does not rely on audio signal, use suitable loudness thus and proofread and correct, thereby prevent that from loud speaker output distortion sound, this makes the user can listen to the music of high tone quality.
Although illustrated and illustrated the present invention with reference to the accompanying drawings, auditory sensibility correction device of the present invention is not limited to above embodiment.Apparent for a person skilled in the art, can be as a plurality of distortion or the change that the present invention is not all deviated from spirit of the present invention described here.Therefore, all these distortion and change all should be looked at as within the scope of the invention.
For example, in the present embodiment, loudness filter section 2 is divided into the audio signal of these three frequency bands of full range band, low-frequency band and high frequency band with audio signal, and maximum detects and maximum maintaining part 3, gain calculating portion 4 and gain are provided with portion 5 and carry out separately and above three corresponding processing of frequency band.Yet, in the present invention, and nonessential audio signal is divided into the audio signal of these three frequency bands of full range band, low-frequency band and high frequency band, but audio signal can be divided into four above frequency bands or two frequency bands.
Claims (3)
1. auditory sensibility correction device comprises:
The loudness processing unit is used for audio signal is divided into the audio signal of different frequency bands, and handles according to band applications loudness;
Differential calculating unit, be used at each frequency band, poor between the signal level of signal level and the audio signal of the full range band that has carried out described loudness processing of audio signal of each frequency band that described loudness handles carried out in calculating by described loudness processing unit, as differential signal;
The gain biasing element is used for the described differential signal that calculates at each frequency band based on by described differential calculating unit, at the gain application migration processing of each frequency band to the audio signal of the full range band that carried out described loudness and handle; And
Gain is provided with parts, the audio signal that is used for having carried out each frequency band that described loudness handles multiplies each other with the correcting gain that has been carried out each frequency band of described migration processing by described gain biasing element, and the audio signal of each frequency band handled of will having carried out multiplying each other and the audio signal addition of having carried out the full range band that described loudness handles.
2. auditory sensibility correction device according to claim 1 is characterized in that, also comprises:
The first answer speed control assembly is used for the audio signal of having been carried out the full range band that described loudness handles by described loudness processing unit is carried out answer speed control, so that the variation of the signal level of this audio signal is level and smooth; And
The gain calibration parts are used for according to the frequency band that will be carried out described migration processing by described gain biasing element, the audio signal using gain that has been changed signal level by the described first answer speed control assembly proofreaied and correct,
Wherein, described gain biasing element carries out described migration processing to the signal that has been carried out described gain calibration by described gain calibration parts.
3. auditory sensibility correction device according to claim 1 and 2 is characterized in that, also comprises:
The second answer speed control assembly is used for carrying out answer speed control by described differential calculating unit at the described differential signal that each frequency band calculated, with at each frequency band to described averaging of differential signal; And
The calculations of offset parts are used for calculating the gain side-play amount of using in the described migration processing of being undertaken by described gain biasing element at each frequency band based on by the differential signal of the described second answer speed control assembly after at each frequency band equalization,
Wherein, described gain biasing element carries out described migration processing by using by described calculations of offset parts at the described gain side-play amount that each frequency band calculates.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
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| JP2007281158 | 2007-10-30 | ||
| JP2007-281158 | 2007-10-30 | ||
| PCT/JP2008/069088 WO2009057488A1 (en) | 2007-10-30 | 2008-10-22 | Auditory sensibility correction device |
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| Publication Number | Publication Date |
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| CN101843115A true CN101843115A (en) | 2010-09-22 |
| CN101843115B CN101843115B (en) | 2013-09-25 |
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| CN2008801141974A Expired - Fee Related CN101843115B (en) | 2007-10-30 | 2008-10-22 | Auditory sensibility correction device |
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| US (1) | US8351619B2 (en) |
| EP (1) | EP2209326B1 (en) |
| JP (1) | JP5345067B2 (en) |
| CN (1) | CN101843115B (en) |
| WO (1) | WO2009057488A1 (en) |
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| CN103248982A (en) * | 2012-02-01 | 2013-08-14 | 哈曼贝克自动系统股份有限公司 | Peak detection when adapting a signal gain based on signal loudness |
| CN103250209A (en) * | 2010-12-08 | 2013-08-14 | 唯听助听器公司 | Hearing aid and method of improved audio reproduction |
| CN104661153A (en) * | 2014-12-31 | 2015-05-27 | 歌尔声学股份有限公司 | Earphone sound effect compensation method and device as well as earphone |
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| JP5903758B2 (en) | 2010-09-08 | 2016-04-13 | ソニー株式会社 | Signal processing apparatus and method, program, and data recording medium |
| JP5459556B2 (en) | 2010-12-14 | 2014-04-02 | 株式会社Ｊｖｃケンウッド | Acoustic characteristic adjusting device, acoustic characteristic adjusting method, and computer program |
| CN104012112B (en) * | 2011-11-22 | 2017-07-25 | 思睿逻辑国际半导体有限公司 | System and method for bass boost |
| JP5957964B2 (en) * | 2012-03-02 | 2016-07-27 | ヤマハ株式会社 | Sound processing apparatus and sound processing method |
| JP6098038B2 (en) * | 2012-03-19 | 2017-03-22 | 富士通株式会社 | Audio correction apparatus, audio correction method, and computer program for audio correction |
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Also Published As
| Publication number | Publication date |
|---|---|
| US20100208917A1 (en) | 2010-08-19 |
| US8351619B2 (en) | 2013-01-08 |
| CN101843115B (en) | 2013-09-25 |
| JP5345067B2 (en) | 2013-11-20 |
| EP2209326A1 (en) | 2010-07-21 |
| JPWO2009057488A1 (en) | 2011-03-10 |
| EP2209326B1 (en) | 2012-12-12 |
| WO2009057488A1 (en) | 2009-05-07 |
| EP2209326A4 (en) | 2011-05-18 |
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